Possible problems caused by mediaplayer

Today, I have been entangled in developing a timer function for a long time. During the test, the thread is refreshed once every second, and then I find that the thread is refreshed four times every four seconds. This is not the result I want. Later, in the group, du Niang and Google had no fruit.

So I created a new Android project and only tested the timer. I found that there was no problem. I guess the current project caused thread blocking, I suddenly thought of a warning when mediaplayer played background music the day before yesterday,

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PS: one may need to declare a corresponding wake_lock permission<Uses-Permission>Element.